Camera optical lens

ABSTRACT

The present disclosure discloses a camera optical lens. The camera optical lens includes, in an order from an object side to an image side, an aperture stop, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens is made of glass material, the second lens is made of plastic material, the third lens is made of plastic material, the fourth lens is made of plastic material, and the fifth lens is made of plastic material. The camera optical lens further satisfies specific conditions.

FIELD OF THE PRESENT DISCLOSURE

The present disclosure relates to optical lens, in particular to acamera optical lens suitable for handheld devices such as smart phonesand digital cameras and imaging devices.

DESCRIPTION OF RELATED ART

With the emergence of smart phones in recent years, the demand forminiature camera lens is increasing day by day, but the photosensitivedevices of general camera lens are no other than Charge Coupled Device(CCD) or Complementary metal-Oxide Semiconductor Sensor (CMOS sensor),and as the progress of the semiconductor manufacturing technology makesthe pixel size of the photosensitive devices shrink, coupled with thecurrent development trend of electronic products being that theirfunctions should be better and their shape should be thin and small,miniature camera lens with good imaging quality therefor has become amainstream in the market. In order to obtain better imaging quality, thelens that is traditionally equipped in mobile phone cameras adopts athree-piece or four-piece lens structure. And, with the development oftechnology and the increase of the diverse demands of users, and underthis circumstances that the pixel area of photosensitive devices isshrinking steadily and the requirement of the system for the imagingquality is improving constantly, the five-piece, six-piece andseven-piece lens structure gradually appear in lens design. There is anurgent need for ultra-thin wide-angle camera lenses which have goodoptical characteristics and the chromatic aberration of which is fullycorrected.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the exemplary embodiments can be better understood withreference to the following drawings. The components in the drawing arenot necessarily drawn to scale, the emphasis instead being placed uponclearly illustrating the principles of the present disclosure.

FIG. 1 is a schematic diagram of a camera optical lens in accordancewith the present invention;

FIG. 2 shows the longitudinal aberration of the camera optical lensshown in FIG. 1;

FIG. 3 shows the lateral color of the camera optical lens shown in FIG.1;

FIG. 4 presents a schematic diagram of the field curvature anddistortion of the camera optical lens shown in FIG. 1;

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

The present disclosure will hereinafter be described in detail withreference to several exemplary embodiments. To make the technicalproblems to be solved, technical solutions and beneficial effects of thepresent disclosure more apparent, the present disclosure is described infurther detail together with the figure and the embodiments. It shouldbe understood the specific embodiments described hereby is only toexplain the disclosure, not intended to limit the disclosure.

Embodiment 1

As referring to FIG. 1, the present invention provides a camera opticallens 10. FIG. 1 shows the camera optical lens 10 of embodiment 1 of thepresent invention, the camera optical lens 10 comprises 5 lenses.Specifically, from the object side to the image side, the camera opticallens 10 comprises in sequence: an aperture St, a first lens L1, a secondlens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. Opticalelement like optical filter GF can be arranged between the fifth lens L5and the image surface Si.

In this embodiment, the first lens L1 has a positive refractive powerwith a convex object side surface relative to the proximal axis, theaperture stop St is arranged between the object and the first lens L1,which can effectively reduce length of the system. The second lens L2has a negative refractive power with a concave object side surfacerelative to the proximal axis and a concave image side surface relativeto the proximal axis. The third lens L3 has a positive refractive powerwith a concave object side surface relative to the proximal axis and aconvex image side surface relative to the proximal axis. The fourth lensL4 has a negative refractive power with a concave object side surfacerelative to the proximal axis and a concave image side surface relativeto the proximal axis which can effectively reduce field curvature of thesystem. The fifth lens L5 has a negative refractive power with a concaveobject side surface relative to the proximal axis and a convex imageside surface relative to the proximal axis, which can effectively reducefield curvature of the system.

Here, the focal length of the whole camera optical lens 10 is defined asf, the focal length of the first lens L1 is defined as f1, the focallength of the second lens L2 is defined as f2, the focal length of thethird lens L3 is defined as f3, the focal length of the fourth lens L4is defined as f4, the curvature radius of the object side surface of thefirst lens L1 is defined as R1, the curvature radius of the image sidesurface of the first lens L1 is defined as R2, the curvature radius ofthe image side surface of the second lens L2 is defined as R4, thethickness on-axis of the first lens L1 is defined as d1. The followingcondition should satisfied: 3<f/R1-f/R2+f*d1/(R1*R2)<4.5,−1.2<f1/f4<−0.2, f/R1<3.399.

When the focal length of the camera optical lens 10 of the presentinvention, the focal length of each lens, the thickness on-axis and thecurvature radius of the camera optical lens satisfy the aboveconditions, the refractive power configuration of each lens can becontrolled/adjusted which can ensure the imaging quality and reducingthe length of the system. Therefore, the camera optical lens 10 has theadvantage of high performance and satisfies the design requirement oflow TTL, more suitable for high-pixel of the portable camera.

In this embodiment, the distance on-axis from the aperture stop to theimage side surface of the fifth lens L5 is defined as SD, the distanceon-axis from the object side surface of the first lens L1 to the imageside surface of the fifth lens L5 is defined as TD. Here the followingcondition should be satisfied: 0.75<SD/TD<1. The unit of distance,radius and center thickness is mm. With such design, the total opticallength TTL of the whole camera optical lens 10 can be made as short aspossible, thus the miniaturization characteristics can be maintained.

The focal length of the whole camera optical lens is defined as f, andthe total optical length of the camera optical lens 10 is defined asTTL. The following condition: 0.75<TTL/f<1 should be satisfied.Preferably, the condition TTL≤7 mm shall be satisfied. This design helpstelephoto lens of the camera optical lens 10 facilitates miniaturizationcharacteristics.

In the camera optical lens 10 of the present invention, each lens ismade of glass material or plastic material, when the lens is made ofglass material, it can increase the freedom of the refractive powerconfiguration of the optical system of the present invention; when thelens material is plastic, the production cost can be effectivelyreduced.

In this embodiment, the first lens L1 is made of glass material, thesecond lens L2 is made of plastic material, the third lens L3 is made ofplastic material, the fourth lens L4 is made of plastic material, andthe fifth lens L5 is made of plastic material, which enables greatimprovement of the optical performance of the camera optical lens 10.

In this embodiment, the distance on-axis from the image side surface ofthe third lens L3 to the object side surface of the fourth lens L4 isdefined as d6, the distance on-axis from the image side surface of thefourth lens L4 to the object side surface of the fifth lens L5 isdefined as d8. Here the following condition should be satisfied:d6/d8<0.2. With such design, the miniaturization characteristics can bemaintained.

In this embodiment, the curvature radius of the image side surface ofthe fourth lens L4 is defined as R8, the curvature radius of the objectside surface of the fifth lens L5 is defined as R9, the followingcondition: −0.35<(R8+R9)/(R8-R9)<−0.15 should be satisfied. Thecurvature radius of the object side surface of the first lens L1 isdefined as R1, the curvature radius of the image side surface of thefirst lens L2 is defined as R2, the following condition:−1<(R1+R2)/(R1-R2)<0 should be satisfied. Such design enables the lensesmade from different optical materials to match each other better, andfurther enables the camera lens 10 to perform better imaging quality.

In this embodiment, the refractive power of the first lens L1 is definedas n1, the refractive power of the second lens L2 is defined as n2, therefractive power of the third lens L3 is defined as n3, the refractivepower of the fourth lens L4 is defined as n4, the refractive power ofthe fifth lens L5 is defined as n5, the maximum value of the n1, the n2,the n3, the n4, and the n5 is defined as Nmax, the following conditionshall be satisfied, 1.6<Nmax<1.7. This design can suppress optical colordifference when the optical lens 10 works.

In this embodiment, the focal length of the whole camera optical lens isdefined as f, and the maximum image height of the camera optical lens isdefined as ImgH. The following condition: 3<f/ImgH<4 should besatisfied.

In this embodiment, the entrance pupil diameter of the camera opticallens is defined as EPD, and the maximum image height of the cameraoptical lens is defined as ImgH. The following condition: 1<EPD/ImgH<2should be satisfied.

Configurations of refractive index and abbe number of the lensesmentioned above can be combined and applied for designing the cameraoptical lens 10. Therefore, the second lens L2 and the third lens L3made from optical materials with high refractive index and low abbenumber can effectively reduce color difference of the system and greatlyimprove the imaging quality of the camera optical lens 10.

Besides, surfaces of the lens are configured to be aspherical forapproaching more controllable variables to correct aberrations, reducethe amount of the lenses, and further to reduce the total length of thecamera lens.

Preferably, inflexion points and/or arrest points can also be arrangedon the object side surface and/or image side surface of the lens, sothat the demand for high quality imaging can be satisfied, thedescription below can be referred for specific implementable scheme.

The design information of the camera optical lens 10 in the embodimentof the present invention is shown in the tables 1 and 2.

TABLE 1 focal length (mm) f 7.25 f1 2.973 f2 −4.3812 f3 6.8807 f4 −4.171f5 −30.669 f12 5.555

Where:

In which, the meaning of the various symbols is as follows.

f: the focal length of the camera optical lens 10;

f1: the focal length of the first lens;

f2: the focal length of the second lens;

f3: the focal length of the third lens;

f4: the focal length of the fourth lens;

f5: the focal length of the fifth lens;

f12: the combined focal length of the first lens L1 and the second lensL2

TABLE 2 Curvature Thickness/Distance Refractive Abbe radius (R) (mm) (d)(mm) power (nd) number (νd) St St ∞ d0= −0.710 L1 R1 2.139 d1= 1.018 nd11.5900 ν1 68.60 R2 −10.454 d2= 0.298 L2 R3 −10.584 d3= 0.230 nd2 1.6610ν2 20.41 R4 4.074 d4= 1.167 L3 R5 43.349 d5= 0.323 nd3 1.6610 ν3 20.41R6 −5.120 d6= 0.050 L4 R7 −11.263 d7= 0.240 nd4 1.5350 ν4 56.11 R8 2.817d8= 1.393 L5 R9 −4.745 d9= 0.860 nd5 1.5440 ν5 55.95 R10 −7.047 d10=0.360 Glass R11 ∞ d11= 0.210 ndg 1.5160 νg 64.16 R12 ∞ d12= 0.82

In which, R1 and R2 represent respectively the object side surface andimage side surface of the first lens L1, R3 and R4 representrespectively the object side surface and image side surface of thesecond lens L2, R5 and R6 represent respectively the object side surfaceand image side surface of the third lens L3, R7 and R8 representrespectively the object side surface and image side surface of thefourth lens L4, R9 and R10 represent respectively the object sidesurface and image side surface of the fifth lens L5, R11 and R12represent respectively the object side surface and image side surface ofthe optical filter GF. Other, the meaning of the various symbols is asfollows.

d0: The distance on-axis from aperture St to the object side surface ofthe first lens L1;

d1: The thickness on-axis of the first lens L1;

d2: The distance on-axis from the image side surface of the first lensL1 to the object side surface of the second lens L2;

d3: The thickness on-axis of the second lens L2;

d4: The distance on-axis from the image side surface of the second lensL2 to the object side surface of the third lens L3;

d5: The thickness on-axis of the third lens L3;

d6: The distance on-axis from the image side surface of the third lensL3 to the object side surface of the fourth lens L4;

d7: The thickness on-axis of the fourth lens L4;

d8: The distance on-axis from the image side surface of the fourth lensL4 to the object side surface of the fifth lens L5;

d9: The thickness on-axis of the fifth lens L5;

d10: The distance on-axis from the image side surface of the fifth lensL5 to the object side surface of the optical filter GF;

d11: The thickness on-axis of the optical filter GF;

d12: The distance on-axis from the image side surface to the imagesurface of the optical filter GF;

nd1: The refractive power of the first lens L1;

nd2: The refractive power of the second lens L2;

nd3: The refractive power of the third lens L3;

nd4: The refractive power of the fourth lens L4;

nd5: The refractive power of the fifth lens L5;

ndg: The refractive power of the optical filter GF;

v1: The abbe number of the first lens L1;

v2: The abbe number of the second lens L2;

v3: The abbe number of the third lens L3;

v4: The abbe number of the fourth lens L4;

v5: The abbe number of the fifth lens L5;

vg: The abbe number of the optical filter GF.

Table 3 shows the aspherical surface data of the camera optical lens 10in the embodiment of the present invention.

TABLE 3 Conic Index Aspherical Surface Index k A4 A6 A8 A10 A12 A14 A16R1 −5.9138E−02 −1.0760E−04 −1.7374E−04  −6.7834E−05 5.1597E−05−1.9736E−05 6.0118E−06 −2.6205E−06 R2  2.0669E+01  2.0076E−02−9.9678E−03   8.5243E−03 −4.9948E−03   1.7573E−03 −3.4043E−04  2.8338E−05 R3  1.9181E+01 −1.6571E−02 3.0085E−03  2.9045E−02−3.9052E−02   2.4266E−02 −7.5581E−03   9.5313E−04 R4  3.6251E+00−5.4677E−02 5.9387E−03  4.1491E−02 −6.9401E−02   5.2730E−02 −2.0152E−02  3.1149E−03 R5  2.6630E+01  2.2392E−02 −1.1798E−01   8.4417E−02−1.4621E−01   4.8437E−02 3.5607E−02 −1.4366E−02 R6 −6.7464E−01−2.2730E−02 8.9950E−02 −2.4226E−01 2.0458E−01 −1.0734E−01 3.5954E−02−4.3161E−03 R7  8.6464E+01 −4.4007E−01 9.1142E−01 −1.2308E+00 1.3298E+00−9.8117E−01 4.0360E−01 −7.0049E−02 R8 −3.7487E+01 −1.6510E−01 3.8341E−01−3.8873E−01 3.3622E−01 −2.0991E−01 7.1790E−02 −9.9968E−03 R9 −2.9901E+00−7.9767E−02 3.0509E−02 −1.7589E−02 1.2710E−02 −4.3306E−03 6.8248E−04−4.1879E−05 R10 −4.3980E+01 −1.1082E−01 3.8963E−02 −1.6762E−026.0464E−03 −1.4179E−03 1.7132E−04 −7.6294E−06

Table 4 and table 5 show the inflexion points and the arrest pointdesign data of the camera optical lens 10 lens in the embodiment of thepresent invention. In which, R1 and R2 represent respectively the objectside surface and image side surface of the first lens L1, R3 and R4represent respectively the object side surface and image side surface ofthe second lens L2, R5 and R6 represent respectively the object sidesurface and image side surface of the third lens L3, R7 and R8 representrespectively the object side surface and image side surface of thefourth lens L4, R9 and R10 represent respectively the object sidesurface and image side surface of the fifth lens L5. The data in thecolumn named “inflexion point position” are the vertical distances fromthe inflexion points arranged on each lens surface to the optic axis ofthe camera optical lens 10. The data in the column named “arrest pointposition” are the vertical distances from the arrest points arranged oneach lens surface to the optic axis of the camera optical lens 10.

TABLE 4 Inflexion point Inflexion point Inflexion point number position1 position 2 R1 0 R2 1 0.905 R3 1 1.205 R4 0 R5 2 0.375 1.135 R6 1 1.175R7 2 0.785 0.905 R8 0 R9 1 1.295 R10 0

TABLE 5 Arrest point number Arrest point position 1 R1 0 R2 0 R3 0 R4 0R5 1 0.525 R6 0 R7 0 R8 0 R9 0 R10 0

FIG. 2 and FIG. 3 show the longitudinal aberration and lateral colorschematic diagrams after light with a wavelength of 470 nm, 510 nm, 555nm, 610 nm and 650 nm passes the camera optical lens 10 in theembodiment. FIG. 4 shows the field curvature and distortion schematicdiagrams after light with the camera optical lens 10 in the embodiment.

Table 6 shows the various values of the embodiments and the valuescorresponding with the parameters which are already specified in theconditions.

As shown in Table 6, the embodiment satisfies the various conditions.

TABLE 6 Embodiment 3 < f/R1 − f/R2 + f*d1/(R1*R2) < 4.5 3.75 −1.2 <f1/f4 < − 0.2, −0.71 f/R1 < 3.399 3.39 0.75 < SD/TD < 1 0.873 −0.35 <(R8 + R9)/(R8 − R9) < − 0.15 −0.26 −1 < (R1 + R2)/(R1 − R2) < 0 −0.661.6 < Nmax < 1.7 1.661 3 < f/ImgH < 4 3.55 1 < EPD/ImgH < 2 1.6 0.75 <TTL/f < 1 0.88 TTL < 7 6.38 d6/d8 < 0.2 0.036

In this embodiment, the pupil entering diameter of the camera opticallens is 3.27 mm, the full vision field image height is 2.04 mm, thevision field angle in the diagonal direction is 30.87°.

It is to be understood, however, that even though numerouscharacteristics and advantages of the present exemplary embodiments havebeen set forth in the foregoing description, together with details ofthe structures and functions of the embodiments, the disclosure isillustrative only, and changes may be made in detail, especially inmatters of shape, size, and arrangement of parts within the principlesof the invention to the full extent indicated by the broad generalmeaning of the terms where the appended claims are expressed.

What is claimed is:
 1. A camera optical lens comprising, from an objectside to an image side in sequence: an aperture stop, a first lens with apositive refractive power, a second lens with a negative refractivepower, a third lens with a negative refractive power, a fourth lens witha positive refractive power, and a fifth lens a negative refractivepower; wherein the camera optical lens further satisfies the followingconditions:3<f/R1−f/R2+f*d1/(R1*R2)<4.5;−1.2<f1/f4<−0.2;f/R1<3.399; where f: the focal length of the camera optical lens; f1:the focal length of the first lens; f4: the focal length of the fourthlens; R1: the curvature radius of object side surface of the first lens;R2: the curvature radius of image side surface of the first lens; R4:the curvature radius of image side surface of the second lens; d1: Thethickness on-axis of the first lens.
 2. The camera optical lens asdescribed in claim 1 further satisfying the following conditions:0.75<SD/TD<1; where SD: the distance on-axis from aperture to the imageside surface of the fifth lens; TD: the distance on-axis from the objectside surface of the first lens to the image side surface of the fifthlens.
 3. The camera optical lens as described in claim 1 furthersatisfying the following conditions:−0.35<(R8+R9)/(R8−R9)<−0.15; where R8: the curvature radius of imageside surface of the fourth lens; R9: the curvature radius of object sidesurface of the fifth lens.
 4. The camera optical lens as described inclaim 1 further satisfying the following conditions:−1<(R1+R2)/(R1−R2)<0;where R1: the curvature radius of object sidesurface of the first lens; R2: the curvature radius of image sidesurface of the first lens.
 5. The camera optical lens as described inclaim 1 further satisfying the following conditions:1.6<Nmax<1.7; where n1: the refractive power of the first lens; n2: therefractive power of the second lens; n3: the refractive power of thethird lens; n4: the refractive power of the fourth lens; n5: therefractive power of the fifth lens; Nmax: the maximum value of the n1,the n2, the n3, the n4, and the n5.
 6. The camera optical lens asdescribed in claim 1 further satisfying the following condition:3<f/ImgH<4; where f: the focal length of the camera optical lens; ImgH:the maximum image height of the camera optical lens.
 7. The cameraoptical lens as described in claim 1 further satisfying the followingcondition:1<EPD/ImgH<2; where EPD: the entrance pupil diameter of the cameraoptical lens; ImgH: the maximum image height of the camera optical lens.8. The camera optical lens as described in claim 1 further satisfyingthe following conditions:0.75<TTL/f<1;TTL<7; where f: the focal length of the camera optical lens; TTL: thetotal optical length of the camera optical lens.
 9. The camera opticallens as described in claim 1 further satisfying the following condition:d6/d8<0.2; where d6: the distance on-axis from the image side surface ofthe third lens to the object side surface of the fourth lens; d8: thedistance on-axis from the image side surface of the fourth lens to theobject side surface of the fifth lens.
 10. The camera optical lens asdescribed in claim 1, wherein the first lens is made of glass material,the second lens is made of plastic material, the third lens is made ofplastic material, the fourth lens is made of plastic material, and thefifth lens is made of plastic material.